Well-casing protector



May 26, 1925.

L. H. PERRY WELL CASING PROTECTOR File@ June 25, 1924 2 Sheets-Sheet 1INVENTOR,

Eer/gy Eiger/jy, v

- ATTORNEY.

May 26, 1925.

L. H; PERRY WELL CSING' PROTECTOR E 'ilgd June 25.

1924 2 Sheets-Sheet 2 FIQE INVENTOR, Leroy ff Perry, BY j A TTORNE Y.

CII Y Patented May 26, 1925.

LEROY H. PERRY, OF ARDENA, CALIFORNIA.

WELIFCASIN G PROTECTOR.

Application filed June 25, 1924. Serial N0. 722,344;l

To all whom t may concer/: l

Be it known that I, LEROY H. PERRY, a citizen of the United States,residing at Gardena, inthe county of Los Angeles and State ofCalifornia, have invented a new and useful Well-CasingTrotector, ofwhich a specification is set forth below.

In this specification, and the accompanying drawing, I shall describeand show a preferred form of my invention, and specifically mentioncertain of its more important objects. I do not limit-myself to theforms disclosed, since various changes and adaptations may be madetherein without departing from the essence of my invention ashereinafter claimed; and objects and vailvantages, other than thosespecifically mentioned, are included within its scope.

My invention-relates to the art of ,deep welldrilling and particularlyto means for preventing rotary tool strings from rubbing against thecasing walls and thereby causing damage. Itis well kno-wn that thecasing, or water string, is -frequently worn through in this manner andthat, especially when a hole has been made in the casing far below the,surface of the ground, it is a very expensive matter to repair suchdamage.

My principal objects in the invention are; first, to provide means atregularly' spaced intervals throughout the length of the revolving toolstring for keeping it out o f direct contact with the casing; second, toprevent abrasion of the walls of the casing bythe tool string byinterposing at the said intervals an a-ntifriction bearmg or, if pre`ferred, a wearing surface to take the abrasion that the casing wouldotherwise be subjected to; and, third, to accomplish the above by meansof a relatively simple and inexpensive device that is well adapted forits intended purpose.

l\l y objects are attained in the manner illustrated in the accompanyingdrawings, in whichr Figure 1 is a longitudinal central section of a deepwell with a preferred embodiment of my! invention therein, the latterbeing shown broken and partlyin longitudinal central section;

Figure 2 is a cross section of the above construction, ure 1; l

Figure 3 is a dis-assembled and broken view in elevation of a toolstring with my casing protector thereon;

taken on t-he line of'Figto iit the outside sleeve has a flange 12Figure 4 is a View similar to Figure 1 lndicating the manner 1n whlch afrlction shoe may be added to my device;

Figure 5 is an elevation on a reduced scale. of the working parts shownin Figure 4; A

Figure 6 is a central longitudinal section of a. well with a modifiedtype of my invention therein; and y Figure 7 is a cross section taken onthe line 7-7 of Figure 6.

Similar reference numerals refer to similar parts throughout theseve-ral views.

In the drawings the casing of a deep we ll is indicated at 8. Withinthis casing isa rotary tool string 9, coupled at intervals as by tooljoints 10 in the manner common to the art. My protector is applied tothe tool string as it is being made up above ground, and ordinarily justabove alternate tool joints. l

The invention comprises a sleeve 11 bored of the tool string. This atthe bottom, and a taper thread 13 at the top. The top end is alsoprovided with a plurality oflongitudinal kerfs 14 so that it maybecontracted by means of nut 15 to tightly grip the tool string. i

Surrounding the'sleeve and floating between flange 12 and nut. 15, is acollar 16 having anr outside diameter only slightly smaller than thebore of the casing. The inside diameter of the collar isv considerablylarger than the body of` sleeve 11. Ordinarilyvboth the collar and thesleeve are hardened. l

In the usually preferred form of my invention, illustrated in Figures 1to 5 inclusive, I employ a relatively large number of hardened smallrolls 17 in the annular space between the sleeve` and the collar. Thisconstruction then constitutes a roller bearing serving to keep vthe.rotary toolstring substantially central in the well and preventing thestring from abrading the casing.

A friction shoe 18 of rubber or similar material may be tpplied to thistypev of casing protector in the manner illustrated in Figures 4 and 5.For this purpose the central portion ofthe outer surface of collar 16 isturned down, leaving a small iiange 19 atl each end. The shoe may besplit angularly as show-n at 20 if the material is notsuliicientlyresilient to be stretched over flanges 19 when being mountedupon the collar.

In the modified type of my invention,

be subjected to is thus transferred to the Collar and sleeve since, byreason of the difference in diameters, there is much less tendency forthe collar to slide against the inner wall of the casingthan there isfor the sleeve to slide against the inner wall of the collar. In thisconstruction the sleeve is made harder than the collar so that it ischiefly the latter that wears. The collars are made of relativelyinexpensive material and are cheaply renewed when worn out. A frictionshoe similar to 18 may be added to the outside of the collar as in thiscase as well as in the case ofthe type of my invention previouslydescribed. Such a shoe will absolutely prevent any abrasion of the wellcasing and will insure that such wear as occurs will take place on thecollar and sleeve. y

The nut 15 is ordinarily designed for use with a spanner wrench, and oneor more peripheral holes 21 are provided for that purpose. t

The construction and method of using my invention will be clearlyapparent from the foregoing descriptionand need not be furtherelucidated. I desire however 'to call attention to the simplicity andrelative cheapness of the device, and particularly to the great savingin repairs to casings its use will bring about. This feature will bereadily appreciated by those familiar with the drilling art.

I claim as my invention:

1. A well casing protector comprising; a flanged sleeve having alongitudinally kerfed taper-threaded end adapted for gripping a toolstring; a nut engaging said thread adapted for contracting said end; anda collar surrounding said sleeve between the flange and nut adapted tocontact with a well casing when lateral pressure is exerted by the toolstring.. v

2. A well casing protector comprising; a flanged sleeve having alongitudinally kerfed taper-threaded end adapted for gripflanged sleeveping a Itool string; a nut engaging said thread adapted for contractingsaid end; and a floating collar-surrounding said sleeve between theflange and nutzvdapted to contact with a Well casing to protect it fromabrasion when lateral pressure is exerted by the tool string.

3. A Well casing protector comprising; a having a longitudinally kerfedtaper-threaded end adapted for gripping a tool string; a nut engagingsaid thread adapted for contracting said end; and a floating collarsurrounding said sleeve between the flange and nut adapted to contactwith a well casing to protect it from abrasion when lateral pressure isexerted by the tool string; the periphery of said collar being ofyieldable friction material.

4. A well casing protector comprising; a flanged sleeve having alongitudinally kerfed taper-threaded end adapted for gripping a. toolstring; a nut engaging said i thread adapted for contracting said end afloating collar surrounding said sleeve between the flange and nut; androlleis between said sleeve and collar.

5. A well ocasing protector comprising; a flanged sleeve having meansfor gripping a tool string; a. floating collar surrounding said. sleeve;and rollers between said collar and* said sleeve; said collarbeing'adapted to contact with a well casing to protect it from abrasionwhen lateral pressure is eX- i erted by the tool string. y

6. A well casing protector comprising; a flanged sleeve having alongitudinally kerfed taper-threaded end adapted for gripping a. toolstring; a nut engaging said thread adapted for contracting said. end; afloating collar surrounding said sleeve between the flange and nut; andhardened rollers between said sleeve and collar; the periphery of saidcollar being ofl yieldable friction material adapted-to contact with awell casing to protect it from'abrasion when lateral pressure is exertedby the tool string.

't'. A well casing protector comprising; a sleeve adapted for gripping atoolv string intermediate the tool string joints; and a floating collarsurrounding said sleeve; said collar having an outside diameter largerthan that of said-joints.

LEROY H. PERRY.

